(389) A (duplicated in error) the first, or any other egg is laid; or when the first chick is hatched. In fact I recall no instance (perhaps the notes on ex- amination will show otherwise) of any connection between full song and nesting activities, other than a negative one.* That is, song declines with the beginning of nesting operations. Full song is not a common occurrence here; even in season--which seems to be now--there will be some days when it is not heard at all on this place. Maybe the birds go elsewhere on those days at the particular time chosen for singing, although this seems doubtful. Full song sung by Both sexes positively sing full song and it is not possible for m both sexes. No in quality difference in to distinguish sexes by any differences in the two songs . quality. rare Invader stimulates full song. It has been noted on this place that the appearance of an invader has stimulated full song on the part of the repelling birds. This song appears to me the exact antithesis of the song of caged birds. Full song is "wild". It is wild and free. It always seems to me as in the nature of a call seeking a response of some kind, and perhaps it is. (These Antiphony notes record an early morning antiphony where the two birds were on opposite sides of the house). This conjecture is to a certain ex- tent supported by the fact that the full song and the undersongs are heard at the same season of the year from the same individuals. Undersong not training for full song Thus the undersongs do not appear in anyway as preliminary approaches to full song--periods of practise. Either Brownie or Greenie can Both sexes sing either at will. and does sing either undersong or full song as occasion demands. Hence,as each has this varied repertoire to draw upon,there must be some reason for the selection of a particular type of song at any given time. Three-quarter song when con- tented. The three-quarter-song phase of the sub- or undersong seems to me to express best of all the bird's pleasure and contentment with its surroundings and state of well-being at the time. When the bird is well fed for the time being, is comfortable in mind *Modify this. Not quite correct statement.